i ride flange less on my scoot and my bike only because it looks cleaner and i don't really see the point of it being their, on my bike i hold near where a flange would be and if i left it on their it would eventually give me a blister(happens a lot with flanges)
and on my scoot i hold on the very out most part of the bar so i wouldn't even be close to the flange so what ever purpose it serves would be totally useless